As with so many things in audio, there is a presumption that stock tubes must be changed out immediately. Much like the presumption that no component can ever stand on its stock feet and some type of footer must be inserted. I've seen numerous posts where someone is getting a new tube amp - didn't even receive it yet - and is already agonizing about what replacement tubes to put into it. IMO, it's F'Kin nuts. Changing tubes, like changing footers, will change the sound. Perhaps that's the one thing everyone agrees on. But beyond that, you have no idea of whether the change will be to your liking. I think your plan of getting input from the manufacturer or the dealer is very sensible. Or - check with other owners on this forum or others and see if there is a consensus of opinion on a particular tube. Otherwise, it's just playing pin the tail on the audiophile. Which is exactly what many people seem to do. Good luck.
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